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The WannaCry ransomware attack that hit nations around the world over the weekend may just be warming up, according to security experts.

Listen: Clark discusses the ransomware attack on the Clark Howard Show Podcast

So what exactly happened?

In this particular case, the ransomware was equipped with an encryption package that automatically downloaded to infected computers.

Once on a computer, it would lock up important files and wouldn’t let them go until the victim paid between $300 to $600 for a digital key to unlock them.

Meanwhile, the bad code would “worm” its way around by scanning other computers on the same network and infiltrating them. So by just one computer on a network getting the infection, an entire network could be crippled by crooks!

Who was behind the attack?

While no one is quite sure, early indications suggest that a hacker group called the Shadow Brokers executed it using code stolen from the U.S. National Security Agency.

What should you do if you’re infected?

If someone is holding your computer hostage for money, never pay the ransom.

First, there’s no way to tell the scammers will unlock it. Second, there’s no way to guaranteed that they won’t load additional viruses on your computer. Third, you’re rewarding bad behavior if you pay them!

Failing that, you may need to contact a professional to clean your computer if you’re infected. Even if you’re able to unfreeze your computer yourself without paying the ransom, elements of the virus could remain behind.